benefactor

noun

person who gives some form of help to benefit a person, group or organization (the beneficiary)

Wiktionary

Pronunciation: /ˈbɛnəˌfæktəː/ / [ˈbɛnəˌfæktʰəː] / /ˈbɛnəˌfæktɚ/

noun

Etymology: From Middle English benefactor, borrowed from Medieval Latin benefactor (“he who bestows a favor”), from Latin benefaciō (“benefit someone”), from bene (“good”) + faciō (“do, make”).

Somebody who gives a gift, often money to a charity.
“anonymous benefactor”
“generous benefactor”
Someone who performs good or noble deeds.